Setscrew



p 1942-v E. c. WHITNEY 2,295,314 7 SET scam Filed May 4.11940 INVENTOR Ernest 6. Whitney.

ATTORNEY Patented Sept. 8, 1942 i 2 a they, aterb iii-:1 :"t'i I I Application yd, 194d, f:=.5 No. 333,398

\ 3 Tankers 1) -This invention relates to improvements in set screws, and more particularly to a hollow set simple in construction, compact,- and very efiicient and durable in use. I

with these and other objects in view, which i will appear as the description proceeds, there have been illustrated in the accompanying drawing three forms in which the invention may be conveniently embodied in practice.

In-the drawing:

Fig. l is an enlarged side view of the first improved form of hollow set screw.

Fig. 2 is a top plan view of the same.

Figs. 3, 4 and 5 are views showing a modified form of set screw as it appears when being driven througha tapped collar and against the periphery of a cylindrical shaft.

Fig. 6 is a bottom view of another modified form of set screw also embodying the invention.

Fig. '7 is a sectional view showing a hollow set screw employed for holding a shaft bushing in position and having an oiler associated therewith for lubricating said shaft through said set screw.

Referring now to the drawing wherein like reference numerals designate like parts throughout the several views,

The hollow set screw it has a hexagonal bore and is provided at both ends as with longitudi= nally projecting circular ribs '32 which are V- shaped in cross-section and having the sharp e es of said ribs substantially centered between the outer and inner periphery of the set screw it.

In the modified form shown in Figs. 3 to 5, provision is made of a flat outer rim 33a. and a fiat inner rim 331) so that when the V-shaped rib 8241 (which is made smaller in this instance) is caused to bite into the surface of a shaft 3% or other article against which the set screw is driven, no burr will be left on the article 35 or shaft whereby it may be easily withdrawn from the surface of said shaft or other article engaged thereby. The action of the rib 32a when striking the surface of the shaft 3% is clearly shown in Figs. 3, 4 and 5, where it will be seen that the rotating rib 32a will first bite into this surface, throwing up annular burrs or ridges 35 and 36, one inside and one outside of the circular rib 32a. These burrs or ridges 35 and 36 will be subsequently smoothed out by the flat outer and inner said set screws may be picked up without visualinspection and screwed into a tapped hole-it be- We and 33b of the set screw when it is finally driven-home," as shown in Fig. 5.

The modified form ofset screw shown in Fig. 3 difiers from the flrsti'orm in that, instead of having its bore $8 hexagonal, twelve V-shaped ribs 3?! will be formed therein-this number of ribs being a multiple of the number of edges on the hexagonal rod It.

In Fig. 7 a set screw of the form shown in Fig. 6 is shown screwed into a shaft-holding member as for engaginga bushing so to hold it securely in position. The bushing 60 is provided .with an oil hole M which is in alinement with the bore so of the set screw. Provision is alsomade of a hollow oiler cap d2 which is screwed into the member as and has a side aperture sin to permit the shaft to be lubricated through the set screw, thus avoiding the necessity of providing additional lubricating means therefor.

. one advantage of the improved type of set screws herein disclosed is that both ends of said set screws are made identical in shape, so that ing aterial which end is inserted first therein. This construction greatly facilitates the installation of set screws, and is of particular importance in production where large numbers oi set screws must be screwed into tapped holes in machines and other manufactured articles.

While there have been disclosed in this speci= fication several forms in which the invention may be embodied, it is to be'understood that these forms are shown for the purpose oi illustration only, and that the invention is not to be limited to the specific disclosures, but may be modified and embodied in various other forms without departing from its spirit. In short, the invention includes all the modifications and embcents coming within the scope of the following claims.

Having thus fully described the invention, what B cled as new and for which it is desired to obtain Letters Patent is: I

l. A set screw comprising a hollow exteriorly threaded cylindrical member, an integral annu lar rib extending from one end face of said member, generally V-shaped in cross-section, with the point of said rib substantially centered between the bore of said member and its external periphery, and flat rims on said end face located member having a non-circular hole extending throughout the length thereof for receiving a driving tool.

2. A set screw comprising a hoilow exteriorly threaded cylindrical member provided with an interior hole of uniform non-circular shape extending throughout the length thereof for receiving. a driving tool of corresponding shape fitted therein, whereby the rotation of said tool will cause said set screw to be screwed into a tapped hole, said set screw having ends of identical shape provided with integral means to bite into a shaft or other member engaged by said set screw-"whereby said set screw may be picked i0 rib of V-shaped cross-section adapted to bite inv to a shaft or other member engaged by said set screw.

- ERNEST C. WHITNEY. 

